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Old 07-16-2009, 10:20 PM
Junior Member
Join Date: Jul 2009
Posts: 2
Default How long can it go ? 2.4Ghz 802.11g / Point to Multi Point / No LOS


I have used and using standard Wifi Access points for home setup.. So my knowledge is just up till that only..

I have reached this forum while googling for a solution so I am puting the question here in this thread, hope forum members can light me up..

In our housing complex we are in need for a Wide Area Wifi 802.11g setup.. Actually our co-operative thought it may be easy to buy large amount of bandwidth and share it rather than every single home / flat applying to different ISP for their need..

The area is about 3km x 2km, below would explain a bit..

Now I think we need Access Points (long range access points) and connectivity between access points..

So what exact solution do we need ?

What are the products to increase the range of 2.4GHz 802.11g wifi and how far can it actually go without any Line of Sight and having multi storied buildings ??

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  #2 (permalink)  
Old 07-17-2009, 12:52 AM
Senior Member
Join Date: May 2009
Posts: 203
Default Good questions, Choto!!

I have analyzed your sketch, added lines of sight and possible AP and Bridge locations.

There are three ways to extend range and clear LOS obstacles. These are; Transmitter power ( in milliwatts), Antenna Gain and Beam pattern and distance above ground.

We need more infromation before making a complete reccomendation.. How tall is each building and how tall are the trees blocking lines of sight? will antenna towers be acceptible?

Buildings 2,3,4 & 6 will each require one AP each in Client Bridge configuration of a minimum of 500 mW (milliwatts). I will leave the suggestions for actual units to the other "Resident Experts". You will also need directional antennas , One for each of the above buildings, of a minimum 12 dB gain. Yagi style antennas are the most directional and have greatest LOS range.

You will require two sets of AP/Yagi's for building 5. This is because building 5 will act as the bridge between building 1 and building 4, sending signal AROUND the indicated trees.

Building One can be set one of two ways.. a single AP with high gain omnidirectional antenna or with 4 separate AP's ( connected to each other to a single router that is, in turn, connected to building 1's main router) with a yagi each.

Both buildin one's options have strength's and weaknesses.

The single Omni antenna option is least expensive and does not require 'aiming'. It is also least 'secure'. Your signal spreading everywhere equally, like light from a light bulb.

Separate AP/antennas are more expensive, but the signal is sent directly to the other buildings in a tight , specific way, like light from a flashlight/torch.

Another suggestion... to reduce cost, invest in AP's the provide Power over Ethernet (PoE) to power the AP's. This will remove the need to run electrical power lines to the AP's.

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  #3 (permalink)  
Old 07-17-2009, 09:44 PM
Junior Member
Join Date: Jul 2009
Posts: 2


Thanks for the reply..

Buildings are much taller than trees.. Typically most of them are 10 / 15 storied ones..

I have been doing some searching and tell me something... couple with a given Access Points which can support this antena, is it possible to create a hotspot for our entire premises ??

17dbi Outdoor Sector Antenna 120 Degree, campground wifi, outdoor wireless network, long range wifi, wireless, network, gns wireless

Yeah, I know although it says 5 miles at 120deg but I guess without LOS that will drop, just have no idea as how much it would drop and how many (Access Point + Antena + Range Amplifier) of those we may need !!!!
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